Surfacing machine



July 7, 1959 .1. P. BRU'CK' SURFACING MACHINE 2 Sheets-She et 1 Filed Nov. 19, 1958 w l. l

INVENTOR. 0/02/27 Era/ck July 7, 1959 i J. P. BRUCK 2,893,177

' SURFACINGI MACHINE Filed Nov. 19, 1958 2 Sheets-Sheet 2 r I L E l/AII 1a 27W :9. 070%.)? 1? Bra/ck .51 a 50 M$ W United States Patent SURFACING MACHINE John P. Bruck, Toledo, Ohio, assignor to American- Lincoln Corporation, Toledo, Ohio, a corporation of Ohio Application November 19, 1958, Serial No. 775,010

6 Claims. (Cl. 51-170) This invention is an improvement over the invention disclosed in my co-pending application Serial No. 703,- 970, filed December 19, 1957.

The invention sought to be covered in this application is an improvement for adjusting the yoke block in relation to the channel plate. The feature of adjusting the channel plate in relation to the pad supporting plate is claimed in said co-pending application.

This invention relates to surfacing machines, and particularly to those of the power driven hand operated type, and its primary object is the provision in such a machine of improved means for translating a rotary movement of a part of the power means into a reciprocatory movement of the surfacing pad.

A further object of the invention is the provision of means for causing said movement translating means to impart an orbital instead of a reciprocatory movement to the pad.

Further objects and advantages of the invention will be apparent from the following detailed description, and from the accompanying drawings illustrating one embodiment thereof, and in which- Figl is a central vertical section of the machine, with parts in full;

Fig. 2 is a section on the line 2-2 in Fig. 1, with the pad driving connection set for translatory movement of the pad;

Fig. 3 is an enlarged top plan view of a pad supporting plate with the adjustable plate moving means involving the subject matter of the present invention also shown in top plan view;

Fig. 4 is a side elevational view of the pad supporting plate or platen;

Fig. 5 is a top plan view of a selectively movable yoke involved in the invention;

Fig. 6 is a central vertical sectional view of the yoke as observed in the plane of line 6-6 on Fig. 5;

Fig. 7 is a fragmental view for the most part in vertical section as observed in the planes of the broken line 7-7 on Fig. 3;

Fig. 8 is a view similar to Fig. 7 wherein cooperating elements have been adjusted for orbital movement of the pad supporting plate;

Fig. 9 is an end elevational view of an adjusting cam involved in the invention; and

Fig. 10 is a side elevational view of said cam.

Referring to the drawings, 1 designates the body casing or frame of the machine which, in the present instance, is of inverted pan-shape and has on its front end portion a motor housing 2 for an electric operating motor 3. This housing has a handle 4 projecting rearwardly therefrom over its rear end, and the customary motor lead wires extend therethrough. The motor control switch trigger 5 is located at the inner end of the handle, as is customary in machines of this type.

The body casing 1 is supported above and united to a surfacing pad supporting platen 6 by a plurality of 2 posts 7 of rubber or other suitable material, preferably of a resilient nature. The pad 6 is preferably of flat,

stiff sheet-like material faced at its under side with apad-like part 8 and over this is drawn a strip of sandpaper 9 or other suitable surfacing material. The ends of this material, in the present instance, are doubled thereof is an upwardly facing channel plate 13 which is fixed to the plate 6 and which embodies a rectangular bottom wall 14 and opposite parallel side walls 15 a and A yoke block 17 of rectangular form in plan is disposed within the channel plate 13 and same includes an upwardly projecting bearing receiving cylindrical portion 18 and the block is provided at one edge thereof with a vertical slot 19 for a purpose later to appear;

The motor shaft 20 extends down into the body casing 1 through its top wall and has suitable driving connection with a member 21 mounted for rotary movement on a vertical stub shaft 22 fixedly projecting down into the body casing from its top and substantially at its center.

The member 21 is provided at its lower end with a stub shaft 23 which is eccentric to the axis of rotation of member 21 and operatively connects With the yoke 17 through a bearing 24 therein whereby orbital movement of the stub shaft 23 normally imparts reciprocatory movements to the yoke block 17 in the guide channel 13.

At this point it is to be observed that for reciprocatory movement of the plate 6 longitudinally thereof, the central longitudinal axis of the guide channel is preferably disposed at approximately 10 angular relation to the longitudinal center line of the plate due to the mass of the medianism and the frictional resistance between the channel plate 13 and the yoke block 17.

The aforementioned reciprocatory movement of the yoke block imparts reciprocatory movement to the plate 6 substantially longitudinally thereof due to the component action of the orbital movement of the yoke block on the flanges 15 and 16 of the channel member.

The primary feature of the present invention is the provision of adjustable means operative to lock the yoke block against reciprocatory movement in the channel plate and to permit such movement at will whereby in the first instance the orbital movement of shaft 23 will be directly transferred to the plate 6.

The means above referred to are particularly illustrated in Figs. 3 and 7 to 10 inclusive, wherein it will be seen that a vertical slot 25 is provided in the side wall 16 of the channel plate 13 and which slot extends a substantial distance into the bottom wall 14. Also, the yoke block 17 is provided with a vertical slot 19 in alignment with the slot 25.

A cam member is disposed adjacent the channel plate 13 and same comprises a shaft 27 having a polygonal head 28 on one end thereof and a cam 29 on the opposite end thereof.

The head 28 is provided with a polygonal key receiving opening 30 which is accessible through an aperture 31 in one of the side walls 6 of the plate 6 and the cam 29 is substantially a quadrant of a circle in side view and includes opposed right angular edges 31 and 32, the latter of which is the vertex of oppositely inclined wall portions 33. The cam member is held in operative position by means of a spring 34 including a Patented July 7, 1959.

tongue 35 which is secured to plate 6 and an arcuate portion36 yieldably engaged with the shaft27 for holding the cam in either of the two alternate positions shown in Figs. 7 and 8.

With'tl'ie camin'the'position'in Fig. 7, the yoke block 17 is .freetoslidein' the channel plate l3w'ith a resulting'reciprocatory'or fore and aft movement of the plate 6,1 whereas when the cam is moved to the position in Fig; 8, the yoke block 17 is locked against reciprocatory movement'irr the channel plate 13 and orbital movement oftheplate '6 results.

By the'provision ofthe tapered edge 32 on the cam, the cam may be readily moved from the position in Fig. 7 to that in Fig. 8 should the slots 25 and 26 be mis aligned' in' the relative movement of the'channel plate and the yoke block.

From the abovedescription, it will be apparent that a-surfacingmachine" is provided, which is capable of being expeditiously adjusted by relatively simple means for effecting reciprocatory or'orbital movement of the pad.

It isto be understood that the present invention is not limited to any specific construction, arrangement or form of 'the cooperating parts, since it is capable of numerous modifications and changes without departing from the sp'irit of theclaims.-

I claim::

1. In a surfacing machine'having a body, apad supporting the body bymeans of a plurality of resilient posts for relative vibrating movement, a power mechanism carried by the body and having an orbital movement member driven' b y the power mechanism adjacent the pad, the pad h'aving a channel plate'rigidly mounted on the top thereof, a yoke member supported by said channel plate for slidable' movement therein, said yoke member receivingsaid" orbital movement member for vibratory movement'of'said pad, and means supported by said pad externally of said channel plate for locking said yoke member 4, against movement in said channel plate for orbital movement of thepad,

2. A surfacing machine according to claim 1, wherein said means comprises alignable vertical slots in adjacent sides of said channel plate and said yoke member, and a cam member rotatably supported by said pad for movement into and out of said'slots-for locking said yoke member against movement in-said channel member when in the first named position.

3. A surfacing'machin'e according-to claim-2, wherein said carn'- is supported on one end of a shaft,-- means rotatably supporting said shaft on said pad and'adjacent said channel plate and key operable means on theother end of said shaft.

4. A surfacing machine'accordingto claim 3, wherein said pad comprises a plate on which said channel plate is supported, said first plate having opposite side flanges adjacent oneof which said key operable means'is disposed, and saidone of' said flanges being provided with an aperture adjacent said keyoperable means for reception ofa key forengagement With said key operable means.

5. A surfacing machine according to claim 3, wherein saidrotatably supporting meanscomprises a leaf spring including a shank'p'ortio'n secured to said pad and an arcuate portion yieldingly' bearing on'said'shaft.

6". A surfacing 'machine'acco'r'din to claim 2, wherein said cam member isqu'adr'ant shaped'and having a radial tapered ed'geforadmissioninto'said slots whether or not same are in alignment.

References Cited-in the file'of this patent UNITED STATES-PATENTS 2,697,898- Osman Dec. 28, 1954 2,775,076 Roods Dec. 25, 1956 2,794,303 Wickes June 4, 1957 2,817,192 Amsden Dec. 24, 1957 

